In Python I have a list of dates as strings:
dates = ['2022-01-01', '2022-01-08', '2022-01-21']
I would like to increment these dates by one day and add them to this list, like so:
dates_new = ['2022-01-01', '2022-01-02', '2022-01-08', '2022-01-09', '2022-01-21', '2022-01-22']
What is the best way to achieve this?
You will need to import a library:
import datetime
First convert the strings to dates using datetime.strptime.
The important part of the code is the datetime.timedelta, is a function to sum days, month or years to a date.
Create a new list to store the dates + 1, and then alternate the old date with the new date, that was calculated.
dates = ['2022-01-01', '2022-01-08', '2022-01-21']
newDates = []
for date in dates:
tempDate = datetime.datetime.strptime(date, '%Y-%m-%d')
tempDate = tempDate + datetime.timedelta(days=1)
tempDate = tempDate.strftime('%Y-%m-%d')
newDates.append(date)
newDates.append(tempDate)
print(newDates)
Result:
['2022-01-01', '2022-01-02', '2022-01-08', '2022-01-09', '2022-01-21', '2022-01-22']
Try:
from datetime import datetime, timedelta
one_day = timedelta(days=1)
dates = ["2022-01-01", "2022-01-08", "2022-01-21"]
out = []
for d in dates:
x = datetime.strptime(d, "%Y-%m-%d")
out.append(d)
out.append((x + one_day).strftime("%Y-%m-%d"))
print(out)
Prints:
['2022-01-01', '2022-01-02', '2022-01-08', '2022-01-09', '2022-01-21', '2022-01-22']
With datetime.timedelta class to get the needed difference/offset in days:
from datetime import datetime, timedelta
from itertools import chain
dates = ['2022-01-01', '2022-01-08', '2022-01-21']
dates_inc = list(chain.from_iterable((d, str((timedelta(days=1) + datetime.strptime(d, "%Y-%m-%d")).date()))
for d in dates))
print(dates_inc)
['2022-01-01', '2022-01-02', '2022-01-08', '2022-01-09', '2022-01-21', '2022-01-22']
datetime.timedelta (which is not a function, btw). An explanation of all the other things you do (which make up most of the solution) would make your answer much better.
datetime.datetimeobject, add a day, and then format them back to strings. What part of this problem are you stuck on? Each of these has individually already been asked and answered on Stack Overflow. Asking a specific question allows us to direct you to the answer to your actual question.